Determination of Magnetic Moments of Magnetite Nanoparticles Aggregates by Optical Methods

摘要

Magnetic birefringence in kerosene based magnetic fluid in variable and pulsing field is investigated. It is shown, that the size of aggregates of defining effect is about 70 nanometers. The absence of spontaneous magnetisation at such aggregates is installed. The value of the parameter connecting the permanent and induced magnetic moments of the aggregate of nanoparticles is experimentally defined.